Machine for turning crank-pins



(No Model.) 2 Sheets-Sheet 1.

H. A. REED & W. H. MADDOCK; MACHINE FOR TURNING GRANK PINS- No.322,320.PatentedJul 14,1885.

WITNESSE ATTORNEY.

N. PETERS. Phowi-ilhomphur. Walhingmn. D4 C.

(No Model.) 2 Sheets-Sheet 2.

H. A. REE D & W. H. MADDOGK. MACHINE FOR TURNING CRANK PINS.

No. 322,320. Patented J ly 14, 1885.-

I N. PETERS, Plwm-Lilhogrlphqr, Whhinglou. 0,6,

"1 UNITED STATES PATENT OFFICE...

HUGH A. REED, or rrrtrsnnne, AND WILLIAM H. MADDOOK, or ALLE eHNnrENNsYLvANIA.

MACHlNE FOR TURNING CRANK-PINS.

SPECIFICATION forming part of Letters Patent No. 322,320, dated July14-, 1885.

l Application filed February 24, 1885. (N model.)

To all whom it 11mg concern:

Be it known that we, Hoar-r A. REED, re siding at Pittsburg, in thecounty of Allegheny and State of Pennsylvania, and VVILL- 1AM H.MADDOOK, residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented or discovered certain new and usefulImprovements in Crank-Pin- Turning Machines, of which improvements thefollowing is a specification.

In the accompanying drawings, which make part of this specification,Figure 1 is aview in side elevation of our improved crank-pinturningmachine. Fig. 2 is a top plan View of the same. Fig. 3 ,is a transversesectional elevation, the section being taken on the line as m, Fig. 2.Fig. 4 is a detail View on an enlarged scale showing the drivingmechanism of the turning-head. Fig. 5 is a transverse sectionalelevation on the line 1 y, Fig. 2. Fig. 6 is an end elevation. Fig. 7 isa view similar to Fig. 5, showing the crank-pin in place. Fig. 8 is aview similar to Fig. 7 on an enlarged scale, the upper part of theturning-head being broken away. Fig. 9 is a detail view of the mechanismfor feeding in the cutting-tool inwardly. Fig. 10 is apartiallysectional view on line 2 a, Fig. 8, of one of the jointsbetween the half-rings of the turninghead. Fig. 11 is a view showingdetails of the mechanism for feeding the cutting-tool transversely. Fig.12 is a detail view showing one wall of the recess for the reception ofthe tool-carrier. Fig. 13 is a view of one side of the tool-carrier.Fig. 14 is a sectional detail of the mechanism for feeding the toolinwardly. Fig. 15 is a face view of the toolcarrier and that part of theturning-head adjacent thereto. Fig. 16 is a sectional view on line '0 c,Fig. 8, of the tool-carrier and parts adjacent thereto.

Our invention relates to that class of machine-tools which are employedfor turning to final shape long lengths of shafting and the crank-pinsformed therewith; and the object is to so construct such a machine thatboth the main portion and crank-pins of engineshafts may be turned onthesame machine, and that perfect parallelism between said main portion andcrank-pin may be obtained; and to these ends our invention consists, ingeneral terms, in the construction and combination of parts, all as morefully hereinafter described and claimed. r

The frame of the machine is formed with a central and two sidebed-plates, 1 and 2 2, the central bed-plate being somewhat lower thanthe side beds and projects a short distance in front of the same, asclearly shown in Figs. 1 and 2. The inner ends of the side bed-platesproject over the central bed toward each other,

andin the upper surface of said beds are formed a series of transverseundercut grooves, 4, for the reception of the heads of the clampingbolts 5, said bolts being adapted tofit in slots or notches in the endsof the clamping-jaws 6 and 7. These clamping-jaws are provided withV-shaped recesses for the reception of the shaft to be turned, which isfirmly held in said jaws and to the beds 2 by the bolts 5, as clearlyshown in Fig. 3. i

In the surface of the bed-plates 2 are cut a series of parallellongitudinal lines or grooves which serve as indices for the adjustmentand alignment of the clampingjaws and the shaft.

On the front and rear edges of the central bed, 1, are formed undercutguideways 8, for the reception of corresponding parts on the carriage 9,supported on said central bed, all as clearly shown in Figs. 7 and 8.

On the carriage 9 is formed a vertical frame or standard, 10, in whichis formed a circular seat for the reception of the revolving head 11,said head being held in place by the semicircular cap-piece 12, havingflanges 13 at its extremities adapted to fit and interlockwithcorrespondingly-shaped flanges 14 at the ends of the seat in thestandard 10, said flanges being held together by bolts 15.

The revolving head, j ournaled as above stated in the standard 10,consists of two semicircular parts or half-rings, and 'in each half-ringis formed a web, 16, partially filling said halfrings and forming,whenthe latter are-placed together in the standard, an oval opening, 17,as clearly shown in several views. In the webs in each half 7 ring areformed wedgeshaped recesses 18 and 19, in which are placed thetool-carriers 20 and 21. These tool-carriers consist of a wedge-shapedblock of metal,

steel by preference, provided with transverse slots 22 on two sides,forthe reception of correspondingly-shaped tongues 23, formed on one wallof each of the recesses 18 19 in the webs 16, and on'a liner, 24,adjustably attached to the opposite wall of said recesses by boltspassing through lateral flanges 26 of the webs 16.

In that wall of each of the recesses which is provided with the tonguesor projections 23, and between said projections, is formed asemicircular transverse groove, 27, (see Fig. 12,) in which is locatedthe threaded shafts 28, and in one side of each tool-carrier, 20 and 21,is formed a similar groove, 29, having in its wall screw-threads adaptedto engage with the threads on the groove 27.

In the shaft 28, midway of its length, is formed a groove, 30, adaptedto engage the forked key-piece 31, (see Figs. 11 and 12,)said key-piecebeing held in a notch formed in the groove 27 midway of its length. Thiskeypiece serves to prevent any longitudinal move ment of the shafts 28;therefore when the said shafts are rotated by wrenches or other suitablemeans fitting on their squared ends the tool-carriers which are inengagement with the threads of said shafts through the medium of thethreaded grooves 30 are moved transversely in the recesses 18 and 19.

The cutting-tools 32, having one of their edges beveled, as clearlyshown, are located in a slot, 33, formed in one side of eachcutter-carrier 20 and 21, said slots being made somewhat wider than thebody of the tool, and the tools are retained .in these slots bylockingplates 34, one edge of said plates being illwardly beveled tobear upon the beveled edges of the tools, as clearly shown in Fig. 15.

The locking-plates are secured in place by bolts passing therethroughand screwing into the block forming the carrier.

The in-and-out adjustment of the tools is effected by the threaded rods35, said rods having bearings in abutinents 36, located at the innerends of the carriers, and having the nuts 37, mounted on their threadedportions, said nuts being arranged in slots 38, in the carrier in therear of the tools, and being provided with nibs or lugs adapted to fitinto openings in the under side of the tools, near their rear ends. (SeeFig. 14.)

On the outer ends of the rods are secured the worm-wheels 39, arrangedto mesh with the screw 40, formed on the rod 41, said rod being mountedin bearings secured on the outer ends of the carrier-blocks, as shown.The outer ends of these rods 41 are made square or any other irregularshape in cross-section for the reception of a wrench or other device forturning the rods.

Around the periphery of the semicircular rings composing the revolvinghead 11 are V-shaped or angular teeth 42, said teeth projecting into agroove, 43, formed on the inner surface of the standard 10 and cap-piece12 by the rims 44, which serve as a seat or bearing-surface for therevolving head. The teeth 42 on the revolving head intermcsh with thecorrespondiugly-shaped teeth on the pinion 45, said pinion being securedto the counter-shaft 46, as against rotation thereon, by a spline andgroove, said groove being made of sufficient length to permit the pinion45 being slid along said shaft an amount equal to the movement of thecarriage 9 on the central bed, 1. The counter-shaft 46 is mounted insuitable beari n gs depending from the under side of the bed 1, and isprovided at one end with the gear-wheel 47, which intermeshes with thepinion on the power-shaft 48, mounted in suitable hearings in one of theside beds, 2.

In the central bed, 1, near its front side, is mounted the shaft 49, onwhich is formed the threads 50, which engage a nut, 51, secured to orformed in an arm extending from the under side of the carriage 9. Thisshaft 49 can be rotated by hand to effect the movement of the carriagethrough the medium of the handwheel 52; or it may be rotated by power inany convenient and well-known manner.

The two semicircular rings composing the revolving head are securedtogether by bolts passing through lugs 52, projecting inwardly from theends of such semicircular rings. By forming the teeth on the revolvinghead and its driving pinion Vshaped or angular, a steadiness anduniformity of motion is obtained in the revolving head unattainable inthe usual construction of teethi. 0., parallel with the axis of thepinion and revolving head.

In using the above-described machine, the revolving head is rotateduntil. the points of junction between its half-rings are in line withthe point of j unetion between the cap plate and the standard 10. Thecap-plate and upper half-ring are removed. The shaft is then placed 011the bed 2 with that portion of the shaft which is to be operated onlying within that portion of the revolving head which has been left inposition in the standard 10. The shaft is then adjusted by sliding theclampingjaws across the beds 2, the operator being aided in making suchadjustment by the index lines running longitudinally of the beds, one ofsaid lines being out so as to lie in avertical plane passing through thecenter of rotation of the revolving head. After the shaft has beenproperly adjusted the upper clampingjaws are put in place,and the upperand lower clamping-jaws are clamped to the shaft and the beds 2. Theupper half ring of the re volving head and the cap-plate are thenreplaced and secured. As soon as the shaft has been adjusted in positionand the parts of the machine replaced an d secured, as above stated, thecarriage 9 is moved to one end of its bed and the toolcarriers areadjusted to the same side of the revolving head. The cutters are thenadjusted inward sufficiently far to effect the desired amount of cut,the rear tool being adjusted a little farther in than the front tool.The adjustment is effected by placing a wrench on the squared end of therod 41 and rotating said shaft and the screw formed thereon. This screwin turn rotates the feed-screw 35, thereby effecting the inward movementof the tool. The revolving head is then rotated through the medium ofthe pinion 45 and its connections with the power-shaft. As the head isrotated the carriage is gradually moved along its bed by means of thethreaded shaft 49 and nut 51, the shaft being rotated by the handwheel52 on the shaft 49, or. by any suitable automatic mechanism applied tosaid shaft. As soon as the carriage has reached the opposite end of itsbed the carriagefeeding mechanism is stopped, and during the furtherrotation of the head the tool carriers are fed in the same direction asthe previous motion of the carriage, such feed of the tool-carriersbeing effected by the rotation of the threaded shafts 28. Although theseshafts can, if desired, be rotated by hand, suitable wrenches beingplaced on their squared ends, it is preferred that such rotation beeffected automatically, a stanwheel', 58, beingplaced upon one end ofeach shaft 28, said wheel being adapted to engage a pin, 54, secured tothe standard 10 in such relation to the path of the starwheel that oneof the arms thereof will engage such pin once during the rotation of thehead, and thereby effect the desired rotation of the shafts 28, and theconsequentmovement of the tool-carriers.

In some instances-as, for example, in the case of small shafts-thestraight portions of such shafts may be turned in any suitable lathe andthe shaft be then transferred to the above described machine for turningthe crank-pin; but in the case of large shafts the entire finishing orturning operation can be performed on our machine; and as the indexlines are made parallel with the movement of the carriage, parallelismof all parts of the shaft can be secured.

\Ve claim herein as our invention-v 1. In a machine for turning crankand other shafts, a central bed having mounted thereon a reciprocatingtool-carriage, in combination with two side beds having their uppersurfaces raised above the upper surface of the central bed,substantially as set forth.

2. In a machine for turning crank-shafts, a central bed having mountedthereon a reciprocatin g carriage, in combination with twoshaft-supporting beds, arranged at the sides of the central bed,projecting in front of the side beds, substantially as set forth.

3. A revolving-head, in combination with toolcarricr, mounted thereinand automatically adjustable transversely of the head, and avertiCally-adjustable cutter mounted in a re cess in the tool carrier,substantially as set forth. 7

4. In a machine for turning crank and other shafts, two beds arranged tosupport the shaft on each side of the portion to be operated on, andprovided with index lines or marks along their faces, i'ncombinationwith clamp-blocks having V-shaped jaws and adapted to be secured to theshaft and to the supporting-beds,

substantially as set forth.

